慕课网-安卓攻城狮视频学习及练习（六）

manifest

A跳转B,在B的文件中用permission权限,然后A就无权跳转到B,如果在A中用uses-permission把权限给了A,那么A就可以跳转到B了.可以通俗的说,permission给B了一把锁,A要进门,就要用uses-permission得到一把钥匙.

onitemclicklister+onscrolllistner

public class FActivity extends Activity implements OnItemClickListener,OnScrollListener{
    private ListView lv;
    private SimpleAdapter sim_adapter;
    private List<Map<String, Object>> datalist;
    @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.factivity);

    lv=(ListView) findViewById(R.id.listView1);
    sim_adapter =new SimpleAdapter(this, getdata(), R.layout.item, new String[]{"pic","text"}, new int[]{R.id.imageView1,R.id.textView1});

    lv.setAdapter(sim_adapter);
    lv.setOnItemClickListener(this);
    lv.setOnScrollListener(this);

}
private List<Map<String, Object>> getdata(){
    datalist =new ArrayList<Map<String,Object>>();  
    for (int i=0;i<10;i++)
    {
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("pic", R.drawable.ic_launcher);
    map.put("text", "慕课网"+i);
    datalist.add(map);
    }
  return datalist;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
    switch (scrollState) {
    case SCROLL_STATE_FLING:
        Map<String, Object> map =new HashMap<String, Object>();
        map.put("pic", R.drawable.ic_launcher);
        map.put("text", "增加item");
        datalist.add(map);
        sim_adapter.notifyDataSetChanged();
        break;
    case SCROLL_STATE_IDLE:

        break;
    case SCROLL_STATE_TOUCH_SCROLL:

        break;

    default:
        break;
    }

}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
    // TODO 自动生成的方法存根

}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    String text=lv.getItemAtPosition(position)+"";
    Toast.makeText(this, "位置："+position+"text="+text, Toast.LENGTH_SHORT)
    .show();

}
}

**Picker:选择器
DatePicker日历选择器
Timepicker时间选择器**

public class FActivity extends Activity {
    private TimePicker tp;
    private DatePicker dp;
    private Calendar cal;
    int year;
    int month;
    int day;
    int hour;
    int minute;

    @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.factivity);

    cal=Calendar.getInstance();//生成日历类的对象实例
    year=cal.get(Calendar.YEAR);
    month=cal.get(Calendar.MONTH)+1;//注意唯一例外是month需要+1
    day=cal.get(Calendar.DAY_OF_MONTH);
    hour=cal.get(Calendar.HOUR_OF_DAY);
    minute=cal.get(Calendar.MINUTE);
    setTitle(year+"-"+month+"-"+day+" "+hour+":"+minute);

    tp=(TimePicker) findViewById(R.id.timePicker1);
    dp=(DatePicker) findViewById(R.id.datePicker1);
    dp.init(year, Calendar.MONTH, day, new OnDateChangedListener() {

        @Override
        public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            setTitle(year+"-"+(monthOfYear+1)+"-"+dayOfMonth+" "+hour+":"+minute);


        }
    });
    tp.setOnTimeChangedListener(new OnTimeChangedListener() {

        @Override
        public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {

            setTitle(year+"-"+month+"-"+day+" "+hourOfDay+":"+minute);
        }
    });
}


}

注意month的加减一问题。
datepicker需要用init（）方法，在方法中调用监听器，而时间选择器直接调用监听器。

dialog形式

匿名内部类实现。

//参数callback是监听器
    new DatePickerDialog(this, new OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            setTitle(year+"-"+(monthOfYear+1)+"-"+dayOfMonth+" "+hour+":"+minute);

        }
    }, year, cal.get(Calendar.MONTH), day).show();

    new  TimePickerDialog(this, new OnTimeSetListener() {

        @Override
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            setTitle(year+"-"+month+"-"+day+" "+hourOfDay+":"+minute);

        }
    }, hour, minute, true);
}

gridview

public class FActivity extends Activity implements OnItemClickListener{
    private GridView gv;
    private SimpleAdapter sim_adapter;
    private List<Map<String, Object>> datalist; 
    int[] iconid={R.drawable.calculate,R.drawable.calendar,R.drawable.clock,
            R.drawable.contact,R.drawable.message,R.drawable.money,R.drawable.notebook,
            R.drawable.rest,R.drawable.setting,R.drawable.studyhat,R.drawable.trashbox,
            R.drawable.weightscale};
    String[] iconname={"calculate","calendar","clock","contact","message","money",
            "notebook","rest","setting","studyhat","trashbox","weightscale"};   
    @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.factivity);


datalist=new ArrayList<Map<String,Object>>();

    gv=(GridView) findViewById(R.id.gridView1);
    sim_adapter=new SimpleAdapter(this, getdata(), R.layout.item, new String[]{"pic","text"}, new int[]{R.id.imageView1,R.id.textView1});
    gv.setAdapter(sim_adapter);

    gv.setOnItemClickListener(this);
}

private List<Map<String, Object>> getdata() {

        for (int i=0;i<iconid.length;i++){
            Map<String, Object> map=new HashMap<String, Object>();
            map.put("pic", iconid[i]);
            map.put("text", iconname[i]);
            datalist.add(map);
        }


        return datalist;


    }

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Toast.makeText(this, "我是"+iconname[position], Toast.LENGTH_SHORT).show();

}




}

spinner

public class FActivity extends Activity implements OnItemSelectedListener{
    private TextView txt;
    private Spinner spin;
    private List<String> list;
    private ArrayAdapter<String> arr_adapter;
    @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.factivity);

    txt=(TextView) findViewById(R.id.textView1);
    spin=(Spinner) findViewById(R.id.spinner1);
    list=new ArrayList<String>();
    list.add("北京");
    list.add("上海");
    list.add("广州");
    list.add("深圳");
    arr_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);
    arr_adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
    spin.setAdapter(arr_adapter);
    spin.setOnItemSelectedListener(this);

}

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    String cityname=arr_adapter.getItem(position);
//  String name =list.get(position);
    txt.setText("我选择居住在："+cityname);

    }
    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        // TODO 自动生成的方法存根

    }

}